home depot, or even ACE hardware, carries a really great "Plant and Aquarium bulb", by GE, that's almost identical to the 9325K power compact also made by GE, which is one of the best plant tubes you can buy.
Best part is they are only $5-$10 depending on wattage. they should be very pinkish/purple when lit. Mix two of those with your two new bulbs, and you should have a decent looking light in the tank, that grows plants well. 2700k will grow plants just fine, but has a kind of sickly yellow look that only looks good on a few types of fish, and not real good on any plants. the GE's will balance that out. it still may not seem as bright as it used to be just because the color temperature isn't real white.
Former advisor and planted tank geek...life's moved on though.